ON A STARK MORNING LAST APRIL AT LATITUDE 88 degrees north, John Huston and Tyler Fish were crossing the Arctic ice cap in a bid to become the first confirmed Americans to ski unsupported to the North Pole. The two men, both in their mid-30s, from Chicago and Ely, Minn., respectively, wore backpacks and harnesses attached to sleds laden with hundreds of pounds of gear. At 10 am, the ice opened beneath Huston's skis, and he plunged from light into the darkness of, the near-freezing water below.
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